While driving the Cayenne S solid CEL came on the panel. Check for codes and pulled up P2177 and P2179 codes from D. Tool. Pulled out MAF's and cleaned with CRC Mass Air Flow cleaner and let dry. Reinstalled MAF into car. Cleared codes and everything was fine. 200 miles later the CEL comes on again, but Cayenne sputtered as I slowed down on freeway exit. Drove another 1/4 mile to house. Checked for codes and P2177 and P2179 came up again. Tried to drive Cayenne up driveway,but would loss idle and stall with increase acceleration. Also, car would stall after starting engine and allowing to idle. There is also a periodic clank sound coming from driver's side wheel well/engine compartment after car stalled a couple of times. Trying to do research on codes by not much information. Any suggestions and directions to troubleshoot problem????

 

The code troubleshooting states:
Only V8 - If this fault is set, both mass air flow sensors must essentially be checked since the main charge signal is calcu- lated from both signals.

Possible fault cause
♦ Intake air system leaking ♦ Leaking exhaust system (draws fresh air) ♦ Incorrect main charge signal from MAF sensor ♦ Fuel pressure too low ♦ Fuel injector(s) mechanically faulty (sticks) ♦ Volume supply of fuel pump too low

1
Read out the fault memory
♦ Check whether addi- tional faults have been recorded
Only fault P2179 was recorded " Step 2
In addition, at least one of the following faults has been recorded: P2193 (FRAO), P0300 - P030x (misfire) " First work through these faults in accordance with the instruction
2
Check mass air flow sensors 1 and 2
♦ Connect the 173 universal test box, 105-pole and the 173-1 adapter cable, DME 7.1.1
♦ Switch on the ignition
Measure signal voltage between DME control module connector:
♦ A, pin 29 and ground
♦ B, pin 109 and ground
Voltage between 0.9 V and 1.1 V " Step 3
if not Replace faulty mass air flow sensor → End
3
Check exhaust system (before catalytic con- verters) for leaks
Leakproof " Step 4
if leak Correct fault, eliminate cause of damage if neces- sary → End
4
Check fuel pressure, volume supply of fuel pump and injection valve (mechanically)
Continue troubleshooting in Engine Manual (Group 1) and Fuel Exhaust Engine Electrics Manual (Group 2) → End

So if the voltage checks out, probably fuel pump(s) going since it's affecting both banks. The troubleshooting for 2177 is essentially the same, including the pin locations to be checked. Hope this helps.

 

Thanks for the feedback. I'll take a look this weekend. Also, I been researching a source for the MAF's, my sources don't have them in stock and don't have an ETA on more inventory. Any suggestions besides dealership?

 

I use either Sunset Porsche or Sonnen Porsche. They offer superior prices to the dealers in Houston. By far.